Adding any emoji as a reaction remains under review.
I am marking this as partially done to let you know a new reactions bar with Like, Heart, Laugh, Surprised, Sad, and Angry has begun rolling out to all users.
😥 I wanted pizzas and beers and bears and ducks and rockets and cars and flags not just those 5
I switched from Slack to Teams and this is the feature that makes me want Slack back
This feature remains on the backlog. We will update you when we have status changes to share.